Exchange 2010 SP2 and Update Rollup 1 deployment

Hello Experts, requesting for your critique of our high-level Exchange 2010 SP2 and UR1 deployment procedure. We have tailored our deployment plan based on existing internet resources and will be happy to receive comments from you regarding anything that we may have missed. We are currently running on Exchange 2010 SP1 Enterprise and are planning to upgrade to SP2. We have three (3) AD sites and only two (2) of these have existing Exchange deployments, as follows:

Your Exchange 2010 design is very nice. Before proceeding the update, My notes to you are..

For client Access Server

1. Issuing a stop command on the CAS array node will terminate all the existing client connection, if it is ok, proceed with the settings - Disable new connections and then stop the server from NLB

2. I hope it wont make any problem, but MS recommends to remove the node from NLB, update the server and re add it to NLB

For DAG Server

1. DAG member running an older version of Exchange 2010 can move its active databases to a DAG member running a newer version of Exchange 2010, but not the reverse. - Make sure you are correct in this.

Have a look on the recommendation mentioned over here and come to a conclusion

When you install an update rollup package, Exchange tries to connect to the certificate revocation list (CRL) Web site. Exchange examines the CRL list to verify the code signing certificate. (To download and view the CRL list, see CodeSignPCA.crl.) If Exchange can't connect to the CRL Web site, the following symptoms may occur:

The installation takes a long time to complete.
You receive the following message during the installation: Creating native images for .Net assemblies
When Exchange isn't connected to the Internet, each CRL request must complete before the installation can continue.

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